Beryllium Copper UNS C17300

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Forging
     Hot Working
     Cold Working
     Annealing
Applications

Introduction

UNS C17300 beryllium copper alloys are heat treatable, ductile and can be mill hardened. They offer tensile strength of 1380 MPa (200 ksi). These steels are suitable for applications requiring good conductivity, high strength and stiffness.

This article will give an overview of UNS C17300 beryllium copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C17300 copper.

Element Content (%)
Cu 97.7
Be 1.9
Co 0.40

Physical Properties

The physical properties of UNS C17300 copper are given in the following table.

Properties Metric Imperial
Density (during age hardening, 2% max. decrease in length and 6% max. increase in density) 8.25 g/cm3 0.298 lb/in3
Melting point 866°C 1590°F

Mechanical Properties

The mechanical properties of UNS C17300 copper are tabulated below.

Properties Metric Imperial
Hardness, Rockwell B 80.0 - 85.0 80.0 - 85.0
Tensile strength, ultimate 515 - 585 MPa 74700 - 84800 psi
Tensile strength, yield 275 - 345 MPa 39900 - 50000 psi
Elongation at break 15.0 - 30.0% 15.0 - 30.0%
Modulus of elasticity 125 - 130 GPa 18100 - 18900 ksi
Poissons ratio 0.300 0.300
Machinability (UNS C36000 (free-cutting brass) = 100%) 20% 20%
Shear modulus 50.0 GPa 7250 ksi

Other Designations

Other designations that are equivalent to UNS C17300 copper include:

  • ASTM B196
  • ASTM B197

Fabrication and Heat Treatment

Machinability

The machinability rate of C17300 copper alloys is 50%.

Welding

C17300 copper alloys can be welded using soldering, brazing, gas shielded arc welding, coated metal arc welding, spot welding, seam welding and butt welding. Oxyacetylene welding is not recommended for this type of alloys.

Forging

C17300 copper alloys are forged at temperatures ranging from 649 to 816°C (1200 to 1500°F).

Hot Working

C17300 copper alloys have good hot working property.

Cold Working

C17200 copper alloys have excellent cold working property.

Annealing

Annealing of C17200 copper alloys is performed at temperature ranging from 774 to 802°C (1425 to 1475°F).

Applications

The following are the major applications of UNS C17300 copper:

  • Electrical/electronic connectors
  • Current-carrying springs
  • Precision screw machined parts
  • Welding electrodes
  • Bearings
  • Plastic molds
  • Corrosion resistant components.

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